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Texas Instruments LM20333MHE/NOPB
- Part No.:
- LM20333MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20333MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:569
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Product details
Overview
LM20333MHE/NOPB from Texas Instruments is a 36V, 3A synchronous buck regulator in HTSSOP-20EP package, featuring current-mode control, 130 mΩ/110 mΩ integrated high-side/low-side MOSFETs, 1.5% feedback voltage accuracy, and frequency synchronization from 250 kHz to 1.5 MHz. It delivers stable point-of-load regulation for FPGA, DSP, and telecom power rails.
For engineers reviewing the LM20333MHE/NOPB datasheet, LM20333MHE/NOPB pinout, LM20333MHE/NOPB application, or LM20333MHE/NOPB equivalent, key selection criteria include input voltage range (4.5–36 V), peak current limit (5.2 A), soft-start programmability, pre-biased startup capability, and thermal shutdown at 170°C.
Technical Context
The LM20333MHE/NOPB implements peak current-mode control with non-linear parabolic slope compensation to ensure stability across output voltages from 0.8 V to VIN−2 V. Its externally compensated error amplifier (gm = 515 µmho, GBW = 7 MHz) supports flexible loop tuning using two components.
It integrates OVP (110% VFB threshold), UVLO (4.25 V rising, 350 mV hysteresis), precision enable (1.25 V threshold, 50 mV hysteresis), and open-drain PGOOD with 20 µs deglitching. The SYNC pin accepts TTL/CMOS-compatible external clocks (250 kHz–1.5 MHz) and defaults to ~200 kHz when floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports wide industrial and automotive bus inputs without pre-regulation |
| Output Current | 3 A continuous - sufficient for mid-power FPGA I/O or core rails |
| Feedback Accuracy | ±1.5% at TJ = −40°C to +125°C - ensures tight output regulation under thermal stress |
| Peak Efficiency | 94% - achieved via synchronous rectification and low RDS(on) MOSFETs (130/110 mΩ) |
| Switching Frequency | 200 kHz (internal default); 250 kHz–1.5 MHz (SYNC-synchronized) - enables inductor size optimization |
| Soft-Start Control | Externally programmable via SS/TRK pin with 4.5 µA current source - prevents input inrush and enables monotonic startup |
| Pre-biased Startup | Supported - avoids sinking current when output is pre-charged, protecting downstream loads like ASICs |
Pinout & Package
LM20333MHE/NOPB uses a thermally enhanced 20-pin HTSSOP package with exposed pad (PWP0020A), requiring PCB ground plane connection for thermal dissipation (θJC = 5.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start or tracking input | 4.5 µA internal current source sets ramp rate; supports external voltage tracking for rail sequencing |
| 2 FB | Feedback input | Connects to resistor divider; references internal 800 mV bandgap for output voltage setting |
| 3 PGOOD | Power-good open-drain output | Asserts low when VOUT deviates >5% from target; requires external 10–100 kΩ pull-up |
| 4 COMP | Error amplifier output | Interface for Type II/III compensation network between COMP and AGND |
| 5,6,15,16 VIN | Main input supply | Accepts 4.5–36 V; multiple pins reduce IR drop and improve current handling |
| 7,8,13,14 SW | Switch node | Drain of low-side NMOS and source of high-side NMOS; connects to inductor and bootstrap capacitor |
| 9,10,11 GND | Power ground | Reference for internal power MOSFETs; must be tied to PCB ground plane |
| 12 AGND | Analog ground | Reference for control circuitry; separate from power GND to minimize noise coupling |
| 17 BOOT | Bootstrap supply | Charged via internal diode from VCC; powers high-side gate driver (SW-to-BOOT capacitor required) |
| 18 VCC | Internal LDO output | Regulated ~5.5 V (up to VIN = 7.2 V); powers internal logic; requires 0.1–1 µF ceramic decoupling |
| 19 EN | Enable with hysteresis | 1.25 V turn-on threshold, 50 mV hysteresis; internal 2 µA pull-up enables default operation if unconnected |
| 20 SYNC | Frequency sync input | Accepts external clock (250 kHz–1.5 MHz); logic-high >2 V, logic-low <0.8 V; floats to ~200 kHz |
| EP | Exposed pad | Thermally connected to GND; must be soldered to PCB ground plane for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Non-linear slope compensation | Parabolic ramp adapts to output voltage, eliminating sub-harmonic oscillation across full VOUT range |
| Programmable soft-start | Capacitor on SS/TRK pin sets precise ramp time; avoids overshoot and enables controlled power-up sequencing |
| Pre-biased load compatibility | Does not sink current at startup - prevents reverse conduction through parasitic paths in multi-rail systems |
| Integrated protection suite | OVP (110% VFB), UVP detection, cycle-by-cycle current limiting (5.2 A peak), thermal shutdown (170°C), and UVLO with hysteresis |
| External frequency synchronization | Synchronizes switching to external clock (250 kHz–1.5 MHz), enabling EMI reduction and multi-converter coordination |
Applications
| Communications Infrastructure | FPGA Core Power |
|---|---|
Use Scenario: Regulating 12 V bus to 1.2 V for baseband processor in 4G/LTE remote radio head. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 3 A with tight transient response and low noise. Use Value: 94% efficiency reduces thermal load in sealed enclosures; SYNC pin enables alignment with system clock to suppress conducted EMI. | Use Scenario: Powering Xilinx Artix-7 FPGA core rail where output must track auxiliary 3.3 V supply during power-up. IC Role / Device Role / Timing Role: Voltage-tracking buck regulator using SS/TRK pin to follow reference ramp. Use Value: Ensures monotonic startup without brownout; pre-biased capability prevents damage from backfeed through FPGA I/O clamps. |
| Automotive ADAS Camera Module | DSP Point-of-Load Supply |
Use Scenario: Converting 24 V vehicle battery to 1.8 V for image signal processor in rear-view camera. IC Role / Device Role / Timing Role: High-input-voltage buck converter with UVLO set to 9 V to survive cold-crank conditions. Use Value: 4.5–36 V input range accommodates automotive transients; thermal shutdown (170°C) protects against under-hood overheating. | Use Scenario: Generating 3.3 V for TI C6000 DSP in industrial motor drive control board. IC Role / Device Role / Timing Role: Efficient, compact DC-DC stage replacing linear regulator to reduce heat and board space. Use Value: Integrated 130/110 mΩ MOSFETs eliminate external switches; 20-pin HTSSOP-EP enables high power density without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116MH/NOPB | Higher input range (6–100 V), external MOSFETs, no integrated low-side switch - requires more external components | Better suited for >40 V industrial or solar inputs; lacks pre-biased startup and internal current limit | Select when input exceeds 36 V or higher efficiency at light load is critical; not drop-in compatible |
| TPS54332DDAR | Lower max input (28 V), 3.5 A output, fixed 500 kHz frequency, no SYNC pin - simpler but less flexible | Ideal for cost-sensitive consumer applications; missing frequency sync and tracking features | Choose for fixed-frequency designs where EMI control via sync is unnecessary and VIN ≤ 28 V |
Compared with LM5116MH/NOPB and TPS54332DDAR, LM20333MHE/NOPB uniquely balances wide input range (4.5–36 V), integrated dual-MOSFETs, programmable soft-start, and SYNC capability - making it optimal for space-constrained, multi-rail embedded systems requiring design flexibility and robust fault handling.
Availability
LM20333MHE/NOPB is available at Aetrix Electronics and suitable for communications infrastructure, automotive ADAS modules, FPGA power delivery, and industrial DSP point-of-load applications requiring stable component supply and long-term production support.
Supply support for LM20333MHE/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM20333MHE/NOPB belongs to TI's high-voltage synchronous buck regulator product line, designed specifically for efficient, compact, and robust DC-DC conversion in industrial, automotive, and communications equipment operating from 4.5 V to 36 V buses.
FAQ
What is the maximum input voltage rating for LM20333MHE/NOPB?
The absolute maximum input voltage (VIN to GND) for LM20333MHE/NOPB is +38 V, but the recommended operating range is +4.5 V to +36 V per the datasheet. Exceeding 36 V may trigger overvoltage protection or degrade reliability. The device includes internal OVP and UVLO circuits to safeguard operation within this window, and sustained operation above 36 V is not guaranteed.
Does LM20333MHE/NOPB support pre-biased output startup?
Yes, LM20333MHE/NOPB supports pre-biased startup: when the output voltage is non-zero at power-on, the device will not sink current from the output until the soft-start ramp exceeds the FB pin voltage. This prevents reverse current flow through load parasitics - critical for FPGA, ASIC, and DSP applications where cross-rail coupling occurs. The behavior is confirmed in the datasheet's "Pre-Bias Startup Capability" section and validated across temperature.
How is the output voltage set on LM20333MHE/NOPB?
The output voltage of LM20333MHE/NOPB is set using an external resistor divider connected to the FB pin, referenced to an internal 800 mV precision bandgap. For example, a 1.2 V output uses RFB1 = 4.99 kΩ and RFB2 = 10 kΩ. The datasheet provides Table 1 with standard values and the formula RFB1 = ((VOUT / 0.8) − 1) × RFB2 for custom voltages. Feedback accuracy remains ±1.5% over −40°C to +125°C.
What is the purpose of the SS/TRK pin on LM20333MHE/NOPB?
The SS/TRK pin on LM20333MHE/NOPB serves dual functions: soft-start timing control and voltage tracking. When used for soft-start, an external capacitor sets the ramp time via a 4.5 µA internal current source. When used for tracking, it follows an external voltage ramp - enabling coordinated power-up with higher-voltage rails. If left unconnected, the device defaults to a 1 ms internal soft-start. Both modes are explicitly documented and electrically verified in the datasheet.
Can LM20333MHE/NOPB synchronize to an external clock, and what are the valid frequency limits?
Yes, LM20333MHE/NOPB can synchronize its switching frequency to an external clock applied to the SYNC pin. Valid input frequencies range from 250 kHz to 1.5 MHz, with logic-high >2 V and logic-low <0.8 V. If SYNC is unconnected or inactive at startup, the device operates at ~200 kHz. This feature is fully specified in the Electrical Characteristics table and supported across the full operating temperature range.
LM20333MHE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM20333MHE/NOPB FAQ
1.How can I place an order for LM20333MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20333MHE/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM20333MHE/NOPB reliable?
The price and inventory of LM20333MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20333MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20333MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20333MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20333MHE/NOPB?
LM20333MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20333MHE/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM20333MHE/NOPB?
For technical support, including LM20333MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20333MHE/NOPB requirements.
6.How does Aetrix verify that LM20333MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20333MHE/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM20333MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20333MHE/NOPB?
All LM20333MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20333MHE/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM20333MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20333MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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